Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Oxygen Transfer through Flexible Tubing and Its Effects on Ground Water Sampling Results (Journal Version).
Author Holm, T. R. ; George, G. K. ; Barcelona, M. J. ;
CORP Author Illinois State Water Survey Div., Champaign.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/145;
Stock Number PB89-119374
Additional Subjects Ground water ; Gaseous diffusion process ; Carbon dioxide ; Dissolved gases ; Mathematical models ; Oxygen ; Permeability ; Plastics ; Sampling ; Gas dynamics ;
Library Call Number Additional Info Location Last
NTIS  PB89-119374 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/14/1989
Collation 8p
A model for the diffusion of gases through polymeric tubing was derived which predicts that the amount of gas transferred is proportional to the tubing length and inversely proportional to the pumping rate. The model was experimentally tested and confirmed for oxygen transfer through fluorinated ethylene-propylene copolymer (FEP) tubing using tubing lengths and flow rates typical of ground water sampling. Diffusion can introduce measurable concentrations of oxygen into initially anoxic water. Diffusive loss of carbon dioxide from water that is oversaturated with respect to atmospheric CO2 does not measurably affect pH under similar usage conditions. (Copyright (c) GWMR 1988.)